Birdhouse



FIG. 1 is a front perspective view of a birdhouse showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof; the right side is a mirror image of the left side, shown;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines are for illustration only and form no part of the claimed design. 

CLAIM The ornamental design for a birdhouse, as shown. 